To eliminate distrust and anxiety as before for a user who worries about the charged amount of a communication charge and to improve the handleability.

Since a mobile telephone terminal 100 with a communication charge prepaid function can be used only at the time of call termination when a remaining money amount paid in advance and registered is O yen, the user who wants to originate a call operates a key pad 102 and performs the prepayment registration of the communication charge in the state of inserting a prepaid card 104 for a telephone to a card reader 101. At this time, a prepaid remaining money amount, a user utilization money amount and a card remaining money amount are all displayed at an LCD 103.